A water pond appears to be 2.7 m deep. If the refractive index of water is 4/3, find the actual depth of the pond.

Solution:

According to the question, apparent depth is 2.7 m and the refractive index of water (μ_w) is 4 / 3

Therefore, using the expression of refractive index we can write

=> Real depth = Apparent depth × μ_w

Real depth = 2.7 × 4 / 3

Therefore, Real depth = 3.6 m